Brain Health: Tea, Chocolate, and Brain Health: Are the Benefits Real?

Written By Shelley Rael, MS RDN

Brain Health: Tea, Chocolate, and Brain Health: Are the Benefits Real?

Tea and chocolate share something with coffee: they contain caffeine.

But they offer more than flavor and caffeine.

Both tea and cocoa contain a variety of other compounds that researchers have studied for their effects on cardiovascular health, inflammation, blood vessel function, and the brain. In particular, tea and cocoa are sources of polyphenols, a large group of naturally occurring plant compounds.

So, do tea and chocolate actually benefit your brain?

The answer, as usual with nutrition research, is: maybe, but it's more complicated than the headline.

Some of the research is promising. Some is inconsistent. And some of the strongest findings come from studies of specific compounds or concentrated extracts rather than from simply drinking a cup of tea or eating a chocolate bar.

So, let’s get into the details.

First, what are polyphenols?

Polyphenols are naturally occurring compounds found in many plant foods and beverages.

You find them in fruits, vegetables, beans, nuts, seeds, tea, coffee, cocoa, and many other foods.

Polyphenols come in many forms. Flavonoids are one large group, and tea and cocoa contain several different types.

Research has found associations between higher dietary flavonoid intake and better cognitive outcomes, including lower odds of cognitive decline. However, much of this research is observational, meaning it can identify relationships but cannot prove that eating more flavonoids causes better brain health.

That's important to note.

We're interested in these compounds, but we don't need to turn them into the latest "superfood.”

Tea: More than just caffeine

If you read my previous post about coffee and caffeine, you may remember that caffeine can temporarily improve alertness and attention.

Tea contains caffeine, too.

According to the FDA, a typical 12-ounce serving contains about 37 milligrams of caffeine in green tea and 71 milligrams in black tea, although the actual amount can vary considerably depending on the tea, preparation, and serving size.

That's generally less than a typical cup of brewed coffee.

But caffeine isn't the only component in tea worth considering.

Tea from the Camellia sinensis plant contains polyphenols, including catechins and other compounds. Tea also contains an amino acid called L-theanine, which has been studied in combination with caffeine for effects on attention, mood, and cognition.

A 2025 systematic review and meta-analysis of randomized controlled trials found that combinations of theanine and caffeine could have small to moderate short-term effects on some measures of cognition and mood. The researchers also emphasized the need for more research using actual tea beverages.

So, again, the evidence is interesting.

It doesn't mean drinking tea will make you smarter. That would be nice, though.

Green tea vs. black tea

This is another place where "tea" isn't one single thing.

Green, black, and oolong teas all come from the same plant, but they're processed differently. That processing changes the polyphenols found in the finished tea.

Green tea retains more of its original catechins, including EGCG. During the oxidation process used to produce black tea, some of those catechins are transformed into compounds such as theaflavins and thearubigins.

Does that mean green tea is better for your brain than black tea?

Not necessarily.

Research has found potential cognitive benefits associated with both green and black tea. A systematic review and meta-analysis of epidemiological studies found that habitual tea consumption was associated with a lower risk of cognitive disorders, with green and black tea both showing associations in some analyses. However, the researchers rated the overall evidence as low- to moderate-quality.

A 2025 meta-analysis specifically examining green tea also found an association between green tea consumption and lower risk of cognitive impairment, although the researchers noted that more longitudinal research is needed.

In other words, I wouldn't tell you to switch from black tea to green tea for your brain.

If you enjoy tea, choose the type you like.

What about sweet tea and flavored teas?

This is where we need to separate the tea from what gets added to it.

Unsweetened tea is a very different beverage from a large sweet tea loaded with added sugar.

Research on tea and health doesn't suggest that adding substantial amounts of sugar suddenly makes the beverage better for your brain.

The same applies to flavored tea beverages. A naturally flavored or herbal tea you enjoy without much added sugar can be a perfectly reasonable beverage choice. A heavily sweetened bottled tea is nutritionally different.

And some "teas" aren't actually tea from Camellia sinensis at all.

Peppermint, chamomile, rooibos, and many other herbal infusions are caffeine-free unless caffeine has been added. They can certainly be enjoyable beverages, but we shouldn't assume they have the same evidence behind them as green or black tea.

Now let's talk about chocolate

This is probably the part everyone was waiting for.

Chocolate contains cocoa, and cocoa contains flavanols, a type of flavonoid.

Cocoa flavanols have attracted considerable interest because they may influence blood vessel function and blood flow, including blood flow to the brain. Small clinical studies have also reported potential effects on cognitive performance.

A 2023 systematic review and meta-analysis of clinical trials found some improvements in measures of cognitive function with chronic chocolate consumption, although only seven trials met the researchers' criteria, and there was considerable variation among the studies.

More recent research is still adding to the picture. A 2026 systematic review and meta-analysis of randomized controlled trials found potential improvements in some measures of executive function, attention, processing speed, and language with chronic dark chocolate or cocoa intake. However, memory results were inconsistent, and there was no significant benefit on the Mini-Mental State Examination.

So yes, legitimate research supports the idea that cocoa flavanols may affect aspects of brain function.

But there's an important catch.

Cocoa isn't the same thing as a chocolate bar

This may be the most important point in the entire chocolate discussion.

The research may be looking at cocoa flavanols, but that doesn't mean every chocolate product delivers the same amount.

Processing can substantially change cocoa's flavanol content. Different chocolate products can also contain very different amounts of cocoa, sugar, and fat.

Chocolate also contains calories in pretty significant amounts.

A small amount of dark chocolate can absolutely fit into an overall eating pattern. But eating large amounts of chocolate because you heard it's good for your brain is probably not the takeaway we want from the research.

And you don't need to eat chocolate at all to get polyphenols.

Tea, coffee, berries, apples, vegetables, beans, nuts, and many other plant foods provide different types of polyphenols. Yes, those fruits and veggies are very much sources of similar substances.

What about the caffeine in chocolate?

Chocolate contains caffeine, too, although considerably less than coffee and typically less than tea.

For example, USDA data lists about 24 milligrams of caffeine in one ounce of dark chocolate containing 60 to 69% cacao solids.

Chocolate also contains theobromine, another naturally occurring methylxanthine.

So, just as we shouldn't assume all of coffee's potential effects come from caffeine, we shouldn't assume chocolate's potential effects come from caffeine alone.

There are multiple compounds involved.

So, are the benefits real?

There is enough evidence here to make tea, cocoa, and their polyphenols scientifically… interesting.

But there's not enough evidence to turn them into prescriptions for brain health.

Drinking unsweetened tea can be a simple way to enjoy a flavorful beverage that provides caffeine and plant compounds.

Eating some chocolate because you enjoy it can certainly fit into your eating pattern.

But you don't need to drink green tea three times a day or eat dark chocolate every afternoon because you are worried about your brain.

And there's an important bigger-picture point here.

The brain doesn't need one special food.

Tea isn't a replacement for vegetables.

Chocolate isn't a replacement for physical activity.

Cocoa isn't a substitute for sleep.

And caffeine isn't a substitute for rest.

Many things influence brain health, including overall dietary patterns, physical activity, sleep, cardiovascular health, social connection, and other aspects of how we live.

Tea and chocolate can be part of that.

They just don't have to carry the whole load.

In another blog, I will take a deeper dive into chocolate and cocoa. What exactly is in them, what does the research show, and is there really a reason to choose dark chocolate?

Because sometimes the most useful nutrition advice isn't "eat more of this."

It's understanding why a food is being studied in the first place.

Sources and further reading:

Shelley Rael, MS RDN

Shelley A. Rael, MS RDN, is a dedicated Registered Dietitian Nutritionist based in New Mexico, USA. As the owner of Real World Nutrition, her private practice, she's passionate about guiding individuals toward eating and living healthier in the real world. Beyond one-on-one consultations, Shelley is a multifaceted professional. She's a podcaster, author, speaker, and consultant known for her commitment to dispelling nutrition myths and providing evidence-based information. Her mission is to empower people to achieve improved health, wellness, and energy without resorting to restrictive diets or misinformation.

https://www.shelleyrael.com/
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